netdev - loading ip_vti breaks IPSec connection

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Message-ID: <CAHjjW16qJgU+cf2-fowyJMRioc61Ko8KF65Qp5Npw9DsoF95VA@mail.gmail.com>
Date:	Fri, 12 Sep 2014 22:39:12 -0500
From:	Joe M <joe9mail@...il.com>
To:	netdev@...r.kernel.org, christophe.gouault@...nd.com
Subject: loading ip_vti breaks IPSec connection

Hello,

I am not sure what I am missing. When I load ip_vti and ip_tunnel
modules, my IPSec connection stops working.

uname -a
Linux master 3.16.2 #86 SMP PREEMPT Fri Sep 12 22:09:11 CDT 2014
x86_64 Intel(R) Pentium(R) CPU G620 @ 2.60GHz GenuineIntel GNU/Linux

- (0:c:/tmp)  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
sudo modprobe ip_vti ip_tunnel
- (0:c:/tmp)  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
ping -c 1 -I 192.168.0.11 192.168.1.232
PING 192.168.1.232 (192.168.1.232) from 192.168.0.11 : 56(84) bytes of data.

--- 192.168.1.232 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

- (0:c:/tmp)  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
sudo modprobe --force --remove ip_vti ip_tunnel
- (0:c:/tmp)  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
ping -c 1 -I 192.168.0.11 192.168.1.232
PING 192.168.1.232 (192.168.1.232) from 192.168.0.11 : 56(84) bytes of data.
64 bytes from 192.168.1.232: icmp_seq=1 ttl=64 time=273 ms

--- 192.168.1.232 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 273.347/273.347/273.347/0.000 ms
- (0:i:/tmp)  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -

Please note that the module was just loaded without any tunnel
configuration. I am not sure

I am using StrongSwan for IPSec configuration and noticed the same
behaviour with libreswan too.

Please let me know if I can provide more details.

Thanks
Joe
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